Nonaqueous electrolyte battery and battery pack

Patent metadata

Field	Value
Publication number	US-10483524-B2
Application number	US-201615261031-A
Country	US
Kind code	B2
Filing date	Sep 9, 2016
Priority date	Mar 10, 2014
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

According to an embodiment, there is provided a nonaqueous electrolyte battery. The nonaqueous electrolyte battery includes a positive electrode, a negative electrode, a separator sandwiched between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The negative electrode contains a negative electrode active material having a Li-absorbing potential of 1 V vs. Li/Li+ or more. An electrical resistance of the negative electrode in a discharged state is within a range of 100 Ω·cm to 100000 Ω·cm. A pore volume ratio of pores having a pore diameter of 1 μm or more in the separator is more than 70%. The pore volume ratio is determined from a cumulative pore volume frequency curve of the separator obtained by a mercury intrusion porosimetry.

First claim

What is claimed is:

1. A nonaqueous electrolyte battery, comprising:
a positive electrode;
a negative electrode;
a separator sandwiched between the positive electrode and the negative electrode; and
a nonaqueous electrolyte,
wherein:
the negative electrode comprises a spinel-type lithium-titanium composite oxide as a negative electrode active material, Li 4+x Ti 5 O 12 where 0≤x≤3, having a Li-absorbing potential of 1 V vs. Li/Li + or more;
an electrical resistance of the negative electrode in a discharged state is within a range of 100 Ω·cm to 100000 Ω·cm;
a pore volume ratio of pores having a pore diameter of 1 μm or more in the separator is within a range of more than 70% to not more than 78%, the pore volume ratio being determined from a cumulative pore volume frequency curve of the separator according to a mercury intrusion porosimetry; and
a mode diameter in a pore diameter distribution curve of the separator according to the mercury intrusion porosimetry is within a range of 1.1 μm to 2.6 μm.

2. The nonaqueous electrolyte battery according to claim 1 , wherein a thickness of the separator is within a range of 3 μm to 25 μm.

3. The nonaqueous electrolyte battery according to claim 1 , wherein the electrical resistance of the negative electrode in the discharged state is within a range of 200 Ω·cm to 1000 Ω·cm.

4. The nonaqueous electrolyte battery according to claim 1 , wherein:
the negative electrode further comprises graphite as a conductive agent; and
a value of AB/CD for the negative electrode falls within a range from 4 to 25, where A (m 2 /g) is a specific surface area of the spinel-type lithium-titanium composite oxide, B is a weight content ratio of the spinel-type lithium-titanium composite oxide in the negative electrode, C (m 2 /g) is a specific surface area of the graphite, and D is a weight content ratio of the graphite in the electrode.

5. A battery pack, comprising the nonaqueous electrolyte battery according to claim 1 .

6. The battery pack according to claim 5 , further comprising a protective circuit.

7. A battery pack, comprising a plurality of the nonaqueous electrolyte batteries according to claim 1 , wherein the nonaqueous electrolyte batteries are electrically connected in series or in parallel, or in a combination of a series connection and a parallel connection.

Assignees

• Toshiba Kk

Inventors

• Saruwatari Hidesato
• Shikota Masataka
• Yamamoto Dai

Classifications

• H01M10/425

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title

• H01M4/485 Primary

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title